<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="lib/jquery.js"></script>
</head>

<body>
    <form action="">
        <input type="text" name="username">
        <input type="password" name="password">
        <button type="submit">提交</button>
    </form>
    <script>
        $("form").on("submit", function (e) {
            e.preventDefault();
            var data = $(this).serialize();
            console.log(data);
        })
    </script>
</body>

</html>